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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6ee161077c53ff0e1e1f71a78029d759ffebdde7cfa946c7ca98a039403b7dc' 
  AND token = 't41vwY9bHulCdjD+BfYhwJdkD4XXflkMoA+VdAGDVwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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