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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '798a24038c7d160b96278f2f939b1edf0f5b6f4b4cbc6a553226a25b65347117' 
  AND token = 'uOze6FZF2Rr5rBUrCgXi7aMiNhtUBk3wTIZx1tPs/p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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