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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58f7d958df2c7b71eff180b212b0ada49aeee4b969b78aefb3cc373d09207f8e' 
  AND token = 'ebLxrTG0zzGnSxA87kjagN0b+ZdAAzwtPxg7tqWK9LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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