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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4f0d09bb9c5667506cf5f4aa70916be3cf4ac81880b8a054af403fa9449674' 
  AND token = 'z10hSQiXtIMUFBQl/J6843z4ZAobgnITo0+ebNeoLZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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