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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e9619495cbf0320ddcadddd070edcdf3f7250d592d7890c55d60fd9b302f60' 
  AND token = '/rRnNXw7sQJsSghgu6YQKZbXxV0CvpMl/Phd1mzgvn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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