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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b8e5c376df90270d2633bc5b89c2f8085ffe82dcd797206248c2fea037e243' 
  AND token = 'iCiEN1JgW/3n2LYitX59J290hXpU0bU8SeZJnAiqJwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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