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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5208189a61cd19281b5278fc31b4a2ec6034e24b086d7f2bb26afa5ab978cfc' 
  AND token = 's8cya26AwVst43VKRIUjCpz3MXHoU4CrHsA3Aa136ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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