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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a4c05537da05613ba108073d4488191b466849a72cadb956215e7a61c7c9e5' 
  AND token = 'ych8JzHJ4IEf3LOgRc67XPYlSqj/z1aN2VJadnPdIM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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