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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c79ef302fd8c7c9a72ab07078ce00abaa57da773ed5bc98855e60a7994dde2c5' 
  AND token = 'amrF/RhFzH6vGnG9mKIA7B2C9gick7XBBvuC0a0LnOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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