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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d32a33224ee21d97a5d14939e96b83a85671230f071b5b6454e8cb298701fb7' 
  AND token = 'IVsdH5xxNPw0UIBIw3i6KP6YOwVFl5TTAspuZV6XZNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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