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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '296f9030bd6dad1e47837e373d0c08cb8a5eff7be8b0aaecbf3d1f92e90675d6' 
  AND token = '1vL6F4G1saWZu9vftdyH1mCbo8GpB65N6OVW1QLZSHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}