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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca19896c75ff9d0785641fa8334345ad3a91a236eba5e72095cd5a0830ac305f' 
  AND token = 'fh1eEXAujuQxU0dUfM95wTd9U3mviAprXrPAC2hVAKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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