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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f99a79f62756d19e98da23f73ec678e0ddda9a55526665f136170c8a4e42948' 
  AND token = 'alAhxHLkvXfplkT7+SY23qv0ysh5mvvnU/E00Va0DEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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