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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1e07cc947657dbd2cc69dd35c1e22eee91308eaa1fb27e5bbe3ca495a068f56' 
  AND token = '2Uq3ya33zud3MPBaT2GJmuxHVeyLd+amk33dIkDSp08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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