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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a129e6d40a495ea642c9590759eafdf3c90347e5b97491c0c754bfb4f99ec7ec' 
  AND token = 'JhC9LxR0nVlPfE6XOwmF8oXPPAd2fE4WRCPBGokHPH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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