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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05bc6419881ba7bfec1f5793552fa1610856fa8e48f86e8f7d53a4e7f2ef05a7' 
  AND token = '6AIYsfLSvUzuzjV10O2+DDNotfD/XogyWVSn57vcOuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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