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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '687dfc045bb9610a802fcab0da1e2cf5458a5b6953f9c4077d7c19db64ce5631' 
  AND token = 'rwSfKAJdcemODr+3iZ4x9k1ppVpRaAoiejaiHW2E2EU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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