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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89f7e8063d842fb02d7bbd01ce6d07e08c726734ffec888b8461629d20d02a15' 
  AND token = 'Ca8mwoXkZMXBqrfH/Y5QI9ZLB0vcEvUrLlIa5OAt0Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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