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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae5f862844f87edfa7b5f48f525e806dd271fdc14a57bf609a712857bd5b0d67' 
  AND token = 's2XQWVXo8u6jK42pVe7Gmh1pLHzidOELMtP1tUaVmV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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