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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95318f5e1e2ffa67166dacb0d763ba1dba6b4bc3bf11cfda6f700b4f227dae29' 
  AND token = 'GBV49Nr3z3kFBNaKw+vumvjH9GCA25CuBnC4eZFDo0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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