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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acb96c86b47b3013f8e0b084e70de1fa2816d14b8fea033d3a8ee91aa0b0e14b' 
  AND token = '40YOWnIyRQKrk7OsJvDpjiZAMSK5/nMlGz7ECzkLEEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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