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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcd420edf0074e298642d51556dac1a4c50d9958dc574bf82b95e84dcffa603a' 
  AND token = '3tXa5KnLV1CFrOcTm9F2vwFqtN4imWWkUj4FigTMOMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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