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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '519c8ba5d3dbd2f8d40a3517ba0251f77c47625255c1b5bf7e4ce7ed3f59fa2a' 
  AND token = 's9xTUVf2DMBqI94+j9IEZhn9duhtFYN7IPmozuJNilc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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