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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d6057d8994d7e399fe00d9ea25173350d80d304ac6411fcef9719ca2805c4da' 
  AND token = 'NH3p0S6mLSz3uVg/SMahu7KGW7G5zQEA0cCrCe9187E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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