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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0853c886f64ceb85afccb0de6ae101d6ef2500dfcc9180a2103d26498d04acf' 
  AND token = 'it6Pcl+Qo1CeOwX3EI0cJyk68MIbX1Pl88a8COIjMzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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