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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f82ec9e8576777c8994826eeef630c643594b4232cf473e52e8d0c962d32a488' 
  AND token = 'FTALveTE0oMR5BqUj+ghjtPi+cGN8JkrjC3t9KxM1/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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