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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0be88405b902dede983aa2fee235876f9d87779fa202aacabff0baf2645a8fe' 
  AND token = 'LRssiwXHjNfmpYQekFp5bqV9+ckF2lfPdVOoTqOnCp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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