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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999177b54f00ff78d3998e5d7cc0ce034f3a767f4c081e9182b091edb5e9a2c2' 
  AND token = '5scCFYeJORGk+1jXPvMgHgmmcejseyPMbPEAM0K9dX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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