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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f34dff974c184753d0284303e4e76639b6a253b2e118a2b7ec76eb4e17a85623' 
  AND token = 'PqtQ/3808I5a/xU758nd1rvTGYZr/juaqRkPGRtjToo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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