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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '103f1f76652055ec4ab094e3ea7c5e832988283691c51c1e5c378e8e04f1592a' 
  AND token = '1R8tDDs075dgyZVq80Sdq0tbQxt2Uix78OfICyxkCec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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