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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b71e9ef953889d2bb6481fe2e4a9c77753fef69f6761fa0a8dfc70ab001b6b53' 
  AND token = 'rimk1GX7sL817FQBQLzf4T4gvwTzDNGAfiHTf9TNFa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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