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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bc705a4b80c2846a66876d14e93adf03355e460ab7ede8132cdd7a513b7750a' 
  AND token = 'NhL7/qR3Ax/asjq26Os60eEWHhJS2jD3FSqjojM0CKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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