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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd5f36acd6eda4f8fde4d1729bf35c0ed5cc3e70ad997982fc0ed4cb690ed7a5' 
  AND token = 'JLPom7rnJy+Mr9GZPjWMEe78gyL1kI+TqQj36xbhCAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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