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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e081f185528b3d0205446c2b45fc1fbdd06abb425debef021c6d6ff973abafe0' 
  AND token = 'jm7RPyvozvtJ14aCpWECLpewyZPkf8ckiTNGN+wRWYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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