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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d25143d051148a8a56b6546c77493def33a21d93d9ce59469a92f0e8fa48b0e' 
  AND token = 'gqV3Z+Eg9vnnoJ45bC9QnKQbzV45d3hpJknVHJE1o34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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