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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c743fbb8943dcca1bca76e8ddb33e2839d48126b69c17ab6d1b32cc9f1d1128b' 
  AND token = 'TBsQPbman0cCtd5kmYrGM9EPY5X/ZKibiPu9q/92V7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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