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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f5a49c3a7cb37ce260313d447c7a266d6f814065d1d7f1d04cef701472e4875' 
  AND token = '1l7JGpJVXAAIUXmHc1BTSyyVO4sd17P9kZSwsoiJT/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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