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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26dc5c1e6ebb76b9923830d88566194c562088dbb1825992565b5c2e196ed27d' 
  AND token = 'lEklDniudxa4Egq+f8MHaGgJSMu9OBQgmzSEqlAM4Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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