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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fae3162178e3c498601e33c69cea010f128432e6f24343ce0e6bea94d180b57' 
  AND token = 'Wsgc0yfDgkKuMHBQ4P9GQ9RyOwnL3IgTWdvP06W0PU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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