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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeb254b310af54a14175f2f542dc8685b4d411e978ab5523144017132bc9d550' 
  AND token = 'KgSht9tuW4WHAmuhYmcqMj2oOZ3pC5xqrXT8hmcTA+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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