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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6d9a14ed93bdf86940001e5f514a93219846ad2951d0b470a04f351fbff5bb8' 
  AND token = 'qF8zEhvjP81x56S/P/kgDZmT3uiupZhHAa2aP291YTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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