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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a570f43cf05c12dedd87ae727d392b81114ed73d01a1cecd4207fade81a3f675' 
  AND token = 'PX715y9GR+VI+5Vx8qJfqyvbu6T9MkYkUpJmVQYVg7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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