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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e314cdad1c0c9b231b6afafbc10485bf9b1bc814f53ab21e2d1f0513d97fe30b' 
  AND token = 'k+G4Exe5c51JExC5+YCejsZ7zGNCa0RA5TptyuNTE/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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