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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61f7cf8e1b77192559f58470f7e3f47ea8016002af3a7b7f0bcf0d89ea3c5cb5' 
  AND token = 'CJyCGWQcbjovBMuWP7o1WRk7hJb+b1rbDZPYp90T02A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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