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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfe4f0f391de5ad8cb853ad23168a80873a29be6173bf740564b5d9651f16933' 
  AND token = 'V085Lpcb2pXSec7/AJpKqVik76W5EdhnOtz1X2ptqB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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