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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17bad4624013da2125188b4d8c14d4dfa249dd9e83a3ae637bee1924b211c481' 
  AND token = '94iVRK2F1/PC690of/Q+9Mp/J03vdjtzkwUbr4izO40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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