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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cff0845fddefd68ae0103d8248be905f9cbfcd510889c4489f33865f3ae0c16c' 
  AND token = 'p2jpm3r2xRklR0TzIyZFDDRAWMynYxIV7qxHg2sZqr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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