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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26c4233e8623179e6af2b9ca5df43867359162204525d41c4b17ae972468144d' 
  AND token = 'nAvLHiu5bfd+18BGIRxrWbe05K0TB2vo2jFzSiMZz3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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