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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03536e1e772a6f982cdc673b098836d0a1ba887daec43e8f91ff5db6452f573d' 
  AND token = 'ny37+h1fHWg1J3v3wBpjXbe6JhX2XvzbS1LD1Rp+gk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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