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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '031069ecc3666b3aacb17a44d8c3e04f9c22c1266bde56d48c9c5ef9f286f29c' 
  AND token = 'lFYQS4yEolV/OQ1EgWNwSPc2DUwE9HTGPoiyayLTnr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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