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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf1fcc0792a3f30125f22cd8732ea015ec4c9ad23c4025f2af9fded2b1c696df' 
  AND token = '9qN1FihuVFp/1i3nGh5hdOeskEfRZ6KY49YpKs3jnvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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