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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc95e9882ab71b08124c8f070d73faf0361ec5b15e650cf4c631a081329902db' 
  AND token = 'LmeTab9V0Yu1MhTzJQwVghan5jmTig9f2b/TZvvi+yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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