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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b8799283d1962075d332e82f6d91d53759433ac29f071cdab62c633ed665e53' 
  AND token = 'a4/2sc4Tf26cqXX67sy3WGM/8l4EqCQCEp4/j14I8+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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