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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3c1513be911431078c49f0001bd410267b9cc12c2cd03fff46d4739e60817a2' 
  AND token = 'koWchl0v79lbVB+B351fnpRZ/3a+AGGAp6eek5bujgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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