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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26c977ca5378e72e68f119a1fed6080efc90bf1cf83fb399e64b3ede7585bdd2' 
  AND token = 'qeIkMnt7uEFGQ5YJgmplL20NscPgbs3oNQXsZI0ff6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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