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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68931279363104c60b2c2a6c0cd0cb864944637df2273ef70ad93f34db2ae947' 
  AND token = '8YKoo7TOUw4GJ2aih2oJYcVZtbS7h1ONAG8o7UXG+Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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