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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77448e4a171c8da70cc7c0796360ed7141bc6f8ffc2202b87b42fb7279291dc9' 
  AND token = 'JNtGJpUiqlJLmoxJ4ELV5yFjrwcp4Q6o7KDhVJDJbPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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