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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '158eabb6c9a6d7af1845b8744ff4954850ebc18530bc467f78da8a26055fe59e' 
  AND token = 'CeJxIpLUiH25H2i+IAfeV9IsMQTx2tCjtvg3D/RbpuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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